Need some help identifying and sourcing a surface mount transformer.

[mattpd]

I need to replace the transformer coils on a bunch of POE surveillance cameras. There are very few markings on them.

Printed on the side is "206" which is on the 4 legged side and "S571" which is on the 5 legged side.

On the bottom each leg is stamped. On the side with 4 legs they are stamped "4" "17" "L" "1"

and on the 5 legged side only the end legs are stamped. The other three appear to be not connected to the coils. The end legs are stamped
"9" "5"

This is all the markings. I don't know if any of it means anything to anyone.

[redwire]

Re: Need some help identifying and sourcing a surface mount transformer.

If you know the buck-converter's IC part number, its app notes can give the transformer's manufacturer and part number.

I would check out Coilcraft's POE transformers, they have quite a few, many based on chipset and Coilcraft is very generous with free samples.

[mattpd]

Re: Need some help identifying and sourcing a surface mount transformer.

If you know the buck-converter's IC part number, its app notes can give the transformer's manufacturer and part number.

I would check out Coilcraft's POE transformers, they have quite a few, many based on chipset and Coilcraft is very generous with free samples.

Thanks for the info, although it was a stupid question to begin with. I thought the coils were hissing/whining because they were bad but it was actually the caps on the output that made them hiss. All better now.

[budm]

Re: Need some help identifying and sourcing a surface mount transformer.

'I thought the coils were hissing/whining because they were bad but it was actually the caps on the output that made them hiss'
Ah, the missing information.

[valentino_val]

Re: Need some help identifying and sourcing a surface mount transformer.

If you know the buck-converter's IC part number, its app notes can give the transformer's manufacturer and part number.

I would check out Coilcraft's POE transformers, they have quite a few, many based on chipset and Coilcraft is very generous with free samples.

Yes this web page is the best for transformer/coil identification